Design of unobscured reflective zoom system with three mirrors

A method for the design of an unobscured reflective zoom system with three mirrors is described. This method applies the vector aberration theory, which helps designers analyze third-order aberrations for optical systems with decentered and tilted surfaces. As the vector aberration theory presents the variation of third-order aberrations in asymmetric systems through analytic expressions, real ray tracing is unnecessary. Hence, the design with vector aberration theory is faster, and the analytic expressions are more comprehensive and intuitive. To demonstrate the practicability of the method, a design example is given, which shows that the presented method can guide designers achieve a good unobscured reflective zoom system with three mirrors.     

Measurement of Diffusion Coefficient of Liquids by Using an Asymmetric Liquid-Core Cylindrical Lens： Observing the Diffusion Process Directly

We report a method for measuring diffusion coefficient D of liquids by using an aplanatic and asymmetric cylinder lens with a liquid core, which is designed as both a diffusion pool and the main imaging element. The precision is better than 10-4 RIU in measuring refractive index. The D values of ethylene glycol （EG） in water are measured for various EG concentrations at 25℃, and Dinf = 1.043 × 10^-5 cm^2/s under the condition of infinite dilution is obtained. The method is characterized by observing the diffusion process directly, faster measurement and obtaining the D value under the condition of infinite dilution.     

阀控非对称缸液压系统建模研究

考虑了阀控非对称缸液压系统中阀与缸之间采用软管连接的情况,构建了系统方程,推导了活塞杆在两个方向,活塞杆伸出和活塞杆缩回时的两个传递函数,分析了两个方向的增益与固有频率,采用了SimHydraulics实物仿真,仿真结果验证了对传递函数的理论分析.     

非对称信息条件下排污申报登记制度的策略

研究如何在污染物排放总量控制中通过排污申报登记获得真实的污染物排放量信息。用对策论的决策树方法建立了非对称信息条件下的惩罚模型 ,分析了在非对称信息条件下管理者与被管理者的策略选择。分析的结论是 :管理者可以以一定的费用与收益对被管理者的行为策略进行约束 ,并影响被管理者在整个对策博弈过程中更为理性地申报排污信息     

简易并购制度的比较考察

简易并购作为公司并购的一种重要形式，域外立法多对此进行了规定，但目前学界对其关注甚少。然而我国的公司并购市场却处以快速的发展中，公司并购成本的巨大也为简易并购制度提供了发展的空间。     

非对称信息下中小企业融资问题研究

一、中小企业信贷难的信息成因 为解决中小企业融资难问题，国内外学者做了大量研究，发现其最重要的原因就在于信息不对称导致的逆向选择和道德风险问题，进而出现”信贷配给”现象，即最需要外部融资的中小企业不仅得不到信贷供给反而被挤出了信贷市场，甚至连支付高于市场平均利率的方式也难以获得资金支持。导致这一矛盾出现的信息不对称主要来自企业、银行和政府三方。     

Asymmetric Heat Conduction in One-Dimensional Hard-Point Model with Mass Gradient

The heat conduction in a one-dimensional （1D） hard-point model with mass gradient is studied. Using numerical simulation, we find an asymmetric heat conduction in this model with greater heat current in the direction of mass increase. The increase of temperature gradient, mass gradient and system size axe found to enhance the asymmetric heat conduction. Based on the collision dynamic of a haxd-point particle, we give a qualitative explanation for the underlying mechanism of asymmetric effect.     

基于PGP的非对称加密技术教学探讨

本文利用PGP软件，介绍了非对称加密技术的基本操作，突破了现行电子商务概论高职教材中对谈加密技术只讲理论，不讲操作的局限，使学生既加深了对加密技术基本理论的理解，又获得了操作PGP软件的技能．     

塑性梁受冲击作用时的动力剪切与弯曲效应分析

本文讨论了受非对称集中冲击作用下的两端固定刚塑性梁的动力响应分析。文中给出了当特征长度 l=6M_0/Q_0小于冲击力作用点到梁端距离时,计入剪切滑移时的解只需对塑性弯曲动力响应问题的解略加修正便可得到,并给出了具体论证和数据结果。     

非对称模型下的顺序诊断算法

讨论了顺序ｔ－可诊断系统的诊断算法问题。在Ｍａｌｅｋ和ＢＧＭ模型下，分别提出了一种顺序诊断算法，这些算法在测试图是二部图的情形下都是多项式时间复杂性的。